Frame

Numbered 24376 to 30939 (approx). Bolt on seat stays with drawback type chainstays for rear wheel adjustment.

Wheels

WM2x19 (f), WM2x19 (r). interchangeable with black enamelled rims. Black spokes with NPB nipples. (Some machines fitted with WM3 rims). Rear with separate rear sprocket carrier assembly. (dogged drive).

Mudguards

6” D section, unvalanced, front and rear. Rear with detachable tail section.

Tanks

Petrol/oil tank black with gold lined panels (saddle tank).Twin screw  type fillers (Screw thread fillers - external thread for welded tanks, internal coarse thread for soldered tanks) with front fitted petrol balance pipe. Single bolt damper arm fixing. Brass lever petrol tap.

Engine

numbered 46000 to 52000 (approx) - 4 valve 499cc with cast iron open valve cylinder head, parallel inlet valves and parallel exhaust. Splayed exhaust ports.18mm side plug. Rockers supported on plates bolted to the cylinder head. Forward mounted ML Maglita. Square based cylinder barrel and plain drive side crankcase. Total loss oiling with vertical adjustable ‘pump’ in timing cover. Polished crankcase finish.

Brakes

8” x 1 1/2” front and rear, coupled with steel shoes. Early examples fitted with sand cast aluminium 1927 racing pattern shoes.

Electrics (optional)

Miller 6” 64E headlamp with rear switch and 34E rear lamp.

Transmission

4 speed gearbox with hand change on RHS of tank. Gearbox with external kickstarter stop and polished case. Steel primary chain cover and ‘angle iron’ type rear chainguard.

Carburetter

Amac type 15MDY with Amac 2 lever or optional twist grip control

Exhaust system

Twin 1 3/4” low-level downpipes into Rudge ‘can’ type silencers and 6” fishtails.

Standard Fittings

1” non adjustable handlebars with folded type inverted levers and André steering damper. André lever type fork damper. Single toolbox fitted behind the rear frame tube across the machine. Rear stand. Battery carrier (where fitted) on offside of machine to the rear of the gearbox. Closed ended ‘D’ section forks.

Extras

Rear brake lock for use when a sidecar is fitted. Rear carrier (at no extra charge).

©  Colin Chapple